Omron SYSMAC CX-Programmer 8.1, Operation Manual

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Editing the SFC Chart Section 3-2
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3-2 Editing the SFC Chart
This section describes the process of creating an SFC chart using the SFC editor to
connect various SFC elements.
3-2-1 Default Elements of an SFC Program
When a new SFC program is created in the project workspace, the following SFC
elements are automatically generated in the SFC editor.
Initial Step
Transition
Step
Transition Conditions
Initial Step
This is the step that becomes active upon program execution start. It is represented by
a double-line frame.
It will be assigned the name, [Step 1] by default, but this can be changed.
For details, refer to
1-3-6 Environmental Settings Unique to the SFC CX-Programming
Functions .
Transition
The transition conditions (conditions for transferring from the active step to the next
step) are set to the right-hand side of a transition in one of the following ways.
•
Bit (Boolean variable or actual address)
•
Inputting a ST expression (other than FALSE)
•
Inputting a transition program name (ladder or ST)
Transition conditions are set to the ST expression “FALSE” (conditions not fulfilled) by
default.
Step
A step is the box in which the processing details for a single process are stored. It is
represented by a single-line frame.
It will be assigned the name, [Step 2] by default, but this can be changed.
For details, refer to
1-3-6 Environmental Settings Unique to the SFC CX-Programming
Functions .
Processes can be added as “actions” in an action block, for execution upon activation
of the step. There is no limit on the number of actions that can be added.